Ansys Autodyn 120 Workshop 01

Workshop 1 2D Fragment Impact

ANSYS AUTODYN

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Workshop 1. 2D Fragment Impact

Workshop Goal and Procedure

Training Manual

Goal: Model a multi-material cylindrical fragment impacting a plate

Procedure: Start AUTODYN standalone Set up the problem in using 2D Axial Symmetry Solve the problem View the results Create animations of the results

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Workshop 1. 2D Fragment Impact

Step 1 – Start AUTODYN standalone

Training Manual

1. Start AUTODYN standalone (Double click autodyn.exe)

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Workshop 1. 2D Fragment Impact

Step 2 - Initiate a new project

Training Manual

2.a Start a new project 2.b Browse to select a project Folder 2.c Enter an Ident “fragment_impact” and a Heading 2.d Select 2D Axial Symmetry 2.e Keep the default set of units (recommended for accuracy) 2.f Accept the data

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Step 3 – Retrieve material data from library

Training Manual

3.a Load material data 3.b Select the following materials from the library: AL 7036 COPPER (Shock, Piecewise JC) Steel 1006 Tantalum (Shock, von Mises)

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3.c Accept the data February 27, 2009 Inventory #002665

Workshop 1. 2D Fragment Impact

Step 4 – Specify an erosion model for each material

Repeat 4.a – 4.f for each material

Training Manual

4.a Select a material 4.b Modify the material data 4.c Select Geometric Strain for the erosion model 4.d Enter “2.0” (200%) for the erosion strain 4.e Select Instantaneous for the Type of Geometric Strain 4.f Accept the data

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Step 5 – Create an Initial Condition Set for the fragment

Training Manual

5.a Select Init. Cond. On Navigation Bar 5.b Select New in the dialog panel 5.c Enter “frag_vel” for the Initial Condition Set Name 5.d Keep the default Velocity Only selection (you will apply it to different materials) 5.e Enter “2000.0” for the X-velocity (The X-axis is always the symmetry axis) 5.f Accept the data

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Workshop 1. 2D Fragment Impact

Step 6 – Generate a Part for the Fragment

Training Manual

6.c Enter “fragment” for the Part Name 6.d Keep the default Lagrange Solver 6.e Keep Part wizard

6.a Select Parts On Navigation Bar

6.f Move to the next step

6.b Select New in the dialog panel ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Workshop 1. 2D Fragment Impact

Step 7 – Define Geometry for the Fragment

Training Manual

7.a Select the Box Predef (default) 7.b Enter (-40.0, 0.0) for the box origin and (40.0,10.0) for the box dimensions 7.c Move to the next step

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Workshop 1. 2D Fragment Impact

Step 8 – Mesh and Fill the Fragment (with AL)

Training Manual

8.a Enter “40” and “10” for the number of cells (elements) in the I(X) and J(Y) direction 8.b Move to the next step 8.c Check Fill with Initial Condition Set (frag_vel is the only one defined) 8.d Select AL 7039 for the material (you fill the entire fragment with Aluminum now, then refill later with additional the materials)

SC

8.e Accept the data

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Step 9 – View the Fragment Part Rotate, Translate, Zoom

Training Manual

9.a Select Plots on the Navigation Bar 9.b Material Location is the default plot 9.c Under Additional Components, check Vectors to view the velocity vectors 9.d Under Additional Components, check Grid to view the mesh

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Workshop 1. 2D Fragment Impact

Step 10 – Partially fill Fragment with Copper 10.a Select Parts on the Navigation Bar

Training Manual

10.d Enter the index range I = 1-41 J = 9-11

10.b Select Fill

10.e Select Fill with Initial Condition Set

10.c Select Block to fill a block of elements in index space

10.f Select COPPER for the material 10.g Accept the data

Copper AL 7036 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 11 – Fill Fragment core with Tantalum

Training Manual

11.b Enter the index range I = 11-31 J = 1-6

11.a Select Block to fill a block of elements in index space

11.c Select Fill with Initial Condition Set 11.d Select TANTALUM for the material

Copper

11.e Accept the data

AL 7036 Tantalum ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 12 – Generate a Part for the Plate

Training Manual

12.c Enter “plate” for the Part Name 12.d Keep the default Lagrange Solver 12.e Keep Part wizard

12.a Select Parts On Navigation Bar

12.f Move to the next step

12.b Select New in the dialog panel ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 13 – Define Geometry for the Fragment

Training Manual

13.a Select the Box Predef (default) 13.b Enter (0.0, 0.0) for the box origin and (30.0,120.0) for the box dimensions 13.c Move to the next step

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Step 14 – Mesh and Fill the Plate

Training Manual

14.a Enter “30” and “60” for the number of cells (elements) in the I(X) and J(Y) direction 14.b Check Grade zoning in Jdirection and enter “1.0” for the fixed size, Times “10”, and select Lower J 14.c Move to the next step 14.d DO NOT Check Fill with Initial Condition Set (only the fragment has an initial velocity) 14.e Select STEEL 1006 for the material (you fill the entire fragment with Aluminum now, then refill later with additional the materials) 14.f Accept the data

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Step 15 – Review the Setup so far

Training Manual

15.a Visually check that materials have been assigned correctly to the fragment 15.b Visually check that all nodes of the fragment have been assigned the initial velocity 15.c Visually check that the mesh for the plate has been graded correctly The 1st 10 radial elements should match the element size of the fragment exactly The remaining elements should increase smoothly in size out to the radius of the plate ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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Step 16 – Set up Interaction between Fragment and Plate

Training Manual

16.a Select Interaction on the Navigation bar 16.b External Gap is the only option available for structured (I,J) Parts 16.c Calculate the Gap size (AUTODYN calculates the recommended Gap size and displays it) 16.d Check the Gap size is valid and that all Parts are initially separated by the Gap size (say yes to all the prompts) An error message tells you that the Fragment and Plate are not separated by the Gap size (they are touching)

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Step 17 – Separate the Fragment and Plate by the Gap size

Training Manual

17.e Enter “0.1” for the X translation 17.a Select Parts on the Navigation Bar

17.f Accept the input (Plate is translated away from the Fragment by the Gap size)

17.b Select the plate Part 17.c Select Zoning

17.g Return to the Interactions menu and run the Check again

17.d Select Translate (under Transformations)

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A message tells you that the interaction has been set up successfully

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Step 18 – Define a Boundary Condition to Clamp the Plate

Training Manual

18.a Select Boundaries on the Navigation Bar

18.b Select New to define a new boundary condition

18.c Enter the Boundary Name “Clamp”

18.d Select Velocity for the Type and General 2D Velocity for the Sub option

18.e Enter “0.0” for the X and Y velocity components

18.f Accept the data

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Step 19 – Apply the Boundary Condition to Clamp Plate

Training Manual

19.a Select Parts on the 19.h Make sure the Navigation Bar boundary condition has been applied correctly 19.b Select the plate by checking Boundaries Part under Additional Components in the 19.c Select Boundary Plots dialog panel 19.d Select J Line 19.e Enter I = 1-31 for the I-range and J = 61 (the top boundary) 19.f Select the “Clamp” Boundary 19.g Accept the data

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Step 20 – Set Solution and Output Controls

Training Manual

20.a Select Controls on the Navigation Bar 20.b Enter a large number for the cycle limit and “0.07” for the Time Limit 20.c Select Output on the Navigation Bar 20.d Request Save files to be written every “0.002” ms

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Workshop 1. 2D Fragment Impact

Step 21 – Load a Plot Settings File (3D View)

Training Manual

21.a Load the plot settings file “fragment_impact.set”

21.b Notice that the loaded plot settings provide a 3D view where the model is rotated through 270 deg.

21.c Extra credits: Try creating this view yourself without loading the settings file

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Step 22 – Solve the Problem

Training Manual

22.a Save your Data

During the solve, the view is automatically updated to show the most current solution

22.b Solve the problem

A summary of the current computation cycle (Cycle #, Time, Timestep) is shown below the view panel,

Press Stop at any time to interrupt the Solve

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Step 23 – View Results from the Save Files

Training Manual

23.a When calculation terminates message gives reason for termination

23.b Pull-down menu allows quick access to all the Save files Try loading and viewing different Save files

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Step 24 – Create a GIF Slide Show of Results

Training Manual

24.a Select Plots on the Navigation Bar 24.b Select Generate multiple slides 24.c Select all the available cycles (i.e. Save files) 24.d Select Start and a GIF animation will be generated (move the window away from the view before doing this if you want to see each slide of the animation being generated clearly) 24.e Close the window when the animation is complete

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Step 25 – Create a GFA Slide Show of Results

Training Manual

25.a Select Setup Slideshow

25.b Change the Image type from gif (default) to gfa 25.c Accept the data

25.d Perform Step 24 again to produce the GFA animation (message is given when GFA animation is complete)

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Step 26 – View the GIF Animation

Training Manual

26.a Select View Slides on the Navigation Bar to start the ANSYS Viewer

26.b Open the GIF animation (select the file “fragment_impact.gif”)

26.c View the animation

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Workshop 1. 2D Fragment Impact

Step 27 – View the GFA Animation

Training Manual

27.a Open the GIF animation (select the file “fragment_impact_00nn.gfa”)

27.c View the animation 27.c Change the animation view

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